Compilare: main.cpp: In function 'void dfs(int)': main.cpp:14:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[nod].size(); ++j) ~~^~~~~~~~~~~~~~~ main.cpp:19:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[nod].size(); ++j) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:45:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); ++i) ~~^~~~~~~~~~~~